JPH01260040A - Weft drawing unit - Google Patents

Abstract

PURPOSE:To provide the title unit so designed that a drawing means is moved from a waiting position to an acting position to come close to a weft inserting off-spec yarn to make a suction of yarn end followed by bearing away from the weaving front to wind said off-spec yarn, thereby ensuring the weft inserting off-spec yarn to be continuously drawn off even no connection of said off-spec yarn to a nozzle. CONSTITUTION:In stopping operation of a machine by occurrence of a weft inserting failure during weaving operation, the weft inserting off-spec yarn 5 is brought to a state with its tip exposed, and the piston rod 28 of a cylinder 26 is lowered in response to an operation command from a controller and a drawing means 2 is moved from a waiting position to an acting position. Thence, a holder is rotated to make a suction port 23 approach the weft 5 followed by jetting a pressurized air from a nozzle 12 to a nozzle receiver 11 to generate a suction air flow in said port 23 to effect suction of the end of said weft 5. This end is then nipped between the nozzle receiver 11 and the nozzle 12 followed by moving said suction port 23 in the direction away from the weaving front 7 and then rotating the nozzle receiver 11 together with the nozzle 12 to draw the weft 5 off.

Description

TECHNICAL FIELD OF THE INVENTION The present invention relates to a device for extracting weft yarn from a front after weaving.

Background of the Invention When a short pick weft insertion defect occurs during weaving and the defective weft yarn is recessed, the weft yarn is only partially present over the weaving width, so the weft yarn is not present due to the short pick. Since the necessary reeding force is not applied in that area, the weft yarn that has already been wefted in that area is not driven in sufficiently. Furthermore, when the tip of the weft thread is folded back and the weft insertion is defective, the folded part is struck in two rows, so the weft thread that was already wefted is driven in excessively at that part. Therefore, shuttle gaps are likely to occur in that area.

For this reason, when there is a problem with the horizontal insertion of the short big,
In addition to the defective weft thread, it is necessary to remove several weft threads that were previously driven. A weft thread extraction device is used to automate such extraction work.

Prior art This type of weft thread removal device is disclosed in Japanese Patent Application Laid-Open No. 59-21.
There are inventions such as No. 757 and Japanese Unexamined Patent Publication No. 61-245339. These inventions can be used to solve problems such as
The cutter on the yarn feeding side is made inactive, the defective weft yarn remains connected to the main nozzle, and the defective weft yarn is pulled out while being gripped. Such extraction means are disclosed in Japanese Patent Publication No. 56-27621 and Japanese Patent Application Laid-open No. 59-11.
Compared to the invention of No. 2053, in which the cut weft yarn is pulled out from the weaving front, the defective yarn can be caught more reliably, but it is difficult to remove the weft yarn that has been wefted before the defective yarn; Therefore, it is not possible to effectively deal with the occurrence of the above-mentioned shuttle stage.

OBJECTS OF THE INVENTION Accordingly, an object of the present invention is to prevent the occurrence of the above-mentioned shuttle gaps by providing a device that can reliably pull out the weft yarn that has been inserted into the weft before the weft insertion failure occurs. That's true.

Solution to the Invention In view of the above-mentioned object, the present invention grips the end of the weft yarn that has been drawn out between the yarn end treatment system and the weave end of the woven fabric by a pulling means, and by the rotational movement of the pulling means. ,
The weft yarn is pulled out from the woven front, and the weft yarn can be pulled out while being separated from the woven front by the first guide means and the second guide means. Here, the extracting means uses an air flow to pull in only one end of the weft yarn in a pulled-out state and pinches it between a pair of nozzles and a nozzle receiver, or uses a pair of claw-like members to pull in only one end of the weft yarn in a pulled-out state. By capturing only the weft threads and then rotating them,
Wind up the weft. Therefore, the weft thread extraction operation is continuously and reliably carried out not only for the defective weft thread but also for several weft threads that were previously inserted.

Structure of the Invention FIGS. 1 and 2 show a weft thread removing device 1 of the present invention.
shows the configuration of

This weft thread removal device 1 is provided on the yarn feeding side and is constituted by a removal means 2, a first guide means 3, and a second guide means 4.

The extracting means 2 grips the end of the weft yarn 5 to be extracted between the weft yarn end processing system 65 and the woven fabric 6, and extracts the weft yarn 5 from the front 7 of the woven fabric 6 by rotational movement. It is assembled by a pair of nozzle receivers 11 and a nozzle 12 housed inside a cylindrical body 10 fixed to the holder 8 by a set screw 9.

That is, the nozzle receiver 11 is hollow and rotatably supported inside the sleeve 13 in the cylinder 10, and is connected to the motor 14, the gear 15 of the motor 1114, and the nozzle 12.
It is supported so that it can be driven by a gear 16 attached to the rear end. Further, the nozzle 12 is located on the sleeve 1 at a position corresponding to the tapered surface 17 of the nozzle receiver 11.
The cylindrical body 10 is moved back and forth in the axial direction and rotatably supported relative to the cylindrical body 3, is biased in the backward direction by a spring 18 at the rear end, and is operated by an integral piston 19 at the rear end, making the cylindrical body 10 a cylinder. It can be moved in the forward direction by driving fluid from the end cap 20 side. The nozzle hole 21 of the nozzle 12 is connected to the nozzle receiver 1.
By injecting air, an air flow in the direction from the outside to the inside of the cylinder body 10 is generated at the suction port 23 of the cylinder body 10. The tip of the nozzle 12 is formed as a tapered surface 24 in order to ensure a secure fit with the tapered surface 17. Note that the rear end portion of this nozzle receiver 11 reaches a portion of the wastebasket 34 attached to the holder 8.

On the other hand, the first guiding means 3 is for moving the extracting means 2 from the standby position to the operating position,
It is constituted by a cylinder 26 attached to a loom frame 25. That is, this cylinder 26 is attached, for example, vertically to the loom frame 25 by a bracket 27, and rotatably supports the holder 8 by a horizontal fulcrum shaft 29 at the tip of a piston rod 28.

The fulcrum shaft 29 and the holder 8 constitute the second X internal means 4 together with the cylinder 30, and the extraction means 2
is moved from the gripping position of the weft 5 in a direction away from the front 7. That is, the cylinder 30 is attached to the piston rod 28 by a support shaft 31 at one end, and is connected to the holder 8 by a piston rod 32 at the other end and a connecting shaft 33 at its tip.

Next, FIG. 3 shows the connection relationship of the controller 35. When this controller 35 receives a start command from the loom control device 36, it controls the cylinders 26 and 26 in a predetermined order.
．． 30, the drive circuit 39 of the motor 14, and the solenoid valve 40, 41 of the nozzle 12 in order to operate them.

Effect of the invention When a weft insertion defect occurs during weaving, the loom control device 3
6 receives the weft stopping command and automatically stops the loom at a predetermined stopping angle without wefting in the next wefting cycle, and then reverses the wefting cycle to bring the weft thread 5 that has been poorly inserted into the wefting state. , gives a start command to the controller 35.

At this point, the controller 35 is sequentially executing operations as shown in FIG.

First, the controller 35 operates the switching valve 37,
By moving the piston rod 28 of the cylinder 26 from the upper limit position to the lower limit position, the extraction means 2
The holder 8 is moved in the downward direction from the standby position to the operating position, and after the descent is completed, the switching valve 38 is driven and the piston rod 32 of the cylinder 30 is advanced, so that the holder 8 is rotated in a reverse direction as shown in FIG. 2 about the fulcrum shaft 29. Rotate clockwise. As a result, the suction port 23 of the extraction means 2
approaches near the weft thread 5 to be extracted. Here, the weft thread 5 is held at the front 7 and also held at the end by the weft end treatment system 5a, but is in a state where it can be separated from them due to the lead-out state.

After the rotation of the holder 8 is completed, the controller 35
opens the electromagnetic valve 40, injects pressurized air from the nozzle 12 toward the center hole 22 of the nozzle receiver 11, and generates an air flow in the suction direction within the suction port 23. As a result, the end of the weft thread 5 to be extracted enters the inside of the cylinder 10 together with the air flow flowing into the suction port 23, and enters the center hole 22 of the nozzle receiver 11 together with the air flow. After confirming this retracted state, the controller 35 closes the solenoid valve 41.
is opened, the nozzle 12 is moved in the forward direction together with the piston 19 against the spring 18, and the nozzle receiver 1
After the end of the retracted weft thread 5 is gripped between the tapered surface 17 of the nozzle 1 and the tapered surface 24 of the nozzle 12, the solenoid valve 40 is closed to stop the injection of air from the nozzle 12. In this way, the end of the weft thread 5 to be extracted enters the interior of the extraction means 2 and is sandwiched between the nozzle receiver 11 and the nozzle 12.

Thereafter, the controller 35 switches the switching valve 38 to move the piston rod 32 of the cylinder 30 backward, thereby rotating the holder 8 clockwise in FIG.
3 in a direction away from the extension line of the front 7 to separate the weft 5 from the front 7, and then drive the drive circuit 39 and rotate the motor 14 to rotate the nozzle receiver 11 together with the nozzle 12. , by winding the weft 5 around their outer circumferences, the weft 5 is removed from the weaving front 7.
I'm going to pull it out. In this way, after a predetermined period of time has elapsed, or after the sensor has confirmed that the weft thread 5 has been removed, the controller 35 in the next step opens the solenoid valve 41 to cause the nozzle 12 to be activated by the force of the spring 18. By retracting the weft yarn 5 and then injecting air through the nozzle 12 again, the coiled weft yarn 5 is removed from the conical surface of the nozzle 12 and fed into the waste basket 34 through the center hole 22 of the nozzle receiver 11. After the weft is discharged, the piston rod 28 of the cylinder 26 is moved back to raise the extraction means 2 to the standby position, and then a signal indicating completion of the extraction operation for one weft thread 5 is sent to the loom control device 36. - Ends continuous control.

Upon receiving this signal, the loom control device 36 reverses the loom again as necessary, brings the previously wefted weft yarn 5 into the weft state, and then gives a start command to the controller 35 again to start the current operation. A command is given to take out the weft thread 5 that has been put in the weft before the weft thread 5 that has been pulled out. Therefore, the controller 35 repeats the above series of sequential operations a predetermined number of times.
The weft thread 5 to be extracted is extracted in the same manner as described above. In this way, the weft thread removal device 1 successively removes the defective weft thread 5 as well as several weft threads 5 that were previously wefted.

Other Embodiments of the Invention In the above embodiment, the extracting means 2 is composed of the nozzle receiver 11 and the nozzle 12 as main parts, but in the embodiment shown in FIGS. It is composed of That is, the pair of claws 42 are supported by a fulcrum pin 43 so as to be openable and closable with respect to the claw holder 51, and are connected to a rod 45 of an actuator 44 inside the holder 51 by a pin 46. The pair of claws 42 intersect with the exclusion bar 48 at the slit 47. This exclusion bar 48 is bent into a U-shape, for example, and is connected to a movable member 50 of a solenoid 49 at both ends, so that it can move forward and backward. This claw holder 51 is rotatably supported by an output shaft 53 of a turning motor 52 attached to the holder 8. Note that the first guide means 3 and the second guide means 4 are constructed in the same manner as in the previous embodiment.

As shown in FIG.
In addition, drive circuits 55 and 56 are provided to drive the actuator 44 and solenoid 49.

FIG. 8 shows a series of operations of this controller 35. After receiving the activation command, the controller 35 moves the extraction means 2 in the downward direction from the standby position to the operating position, and then drives the actuator 44 in the closing direction by the drive circuit 55, similarly to the above embodiment. Gripping one weft thread 5 to be extracted between a pair of claws 42,
After confirming that the grasping state is completed, the cylinder 30 is operated and the holder 8 is rotated clockwise in FIG. , winding motor 5
Start 2. This motor 52 rotates, and the pair of claws 4
2 rotates around an output shaft 53 and winds up the weft 5 around the outer periphery of the pair of pawls 42, thereby pulling the weft 5 away from the woven fabric 7 while pulling it out. After this winding is completed, the controller 35 controls the solenoid 49
By activating and moving the removal bar 48 in the direction of the arrow, the weft thread 5 wound around the outer periphery of the pair of claws 42 is discharged, and the waste basket or waste basket installed below is discharged.
(both not shown). After confirming its discharge, the actuator 44 is operated to open the pair of claws 42, and the solenoid 49 returns the exclusion bar 48 to its original position, and the cylinders 26 and 30 are sequentially operated to remove the extraction means 2. Move it to the standby position.

In both of the above two embodiments, the necessary movement is given to the holder 8 by a combination of the vertical movement of the first guide means 3 and the second guide means 4 and the turning movement. The guide means 3 and the second guide means 4 can also be constituted by known guide drive means in the X-Y axis direction, such as a belt and a rack and pinion.

Moreover, as shown in Utility Model Application No. 61-150876, the extracting means 2 may sandwich the weft yarn 5 between a pair of winding bodies and then extract it by rotation.

Modification: The weft thread removal device of the above embodiment may be further provided between the weft thread end treatment system on the opposite yarn feeding side and the weaving end, or alternatively, the weft thread removal device of the above embodiment may be provided on the yarn feeding side.
By providing a conventional device such as No. 339 and combining this with the above-mentioned weft yarn removal device provided on the opposite yarn feeding side, it becomes possible to easily and completely remove defective yarns in a state of body breakage.

That is, the trunk breakage state is detected by a combination of a known weft thread detector placed at a position where the weft thread tip reaches and a weft thread detector placed at a position where the weft thread tip does not reach,
Both the yarn feeding side and non-yarn feeding side devices may be operated based on this detection signal.

Effects of the Invention In the present invention, when a weft insertion failure occurs, only one weft thread that has been taken out is securely gripped by the pulling means and moved in a direction away from the front, and then removed from the front by winding. Since the weft yarn is pulled out, continuous extraction of the weft yarn is possible even if the weft yarn is not connected to a nozzle. Therefore, in addition to defective yarns such as short picks, it is also possible to remove several weft yarns that were previously wefted.

In particular, according to an embodiment in which the extracting means draws the end of the weft thread to be extracted between the nozzle receiver and the nozzle by the action of the air flow, only one weft thread in the lead-out state is moved to the winding position by the air flow in the suction direction. Due to the reliable guidance, the capture of one weft thread is ensured and therefore one
The extraction of books one by one is carried out in an orderly manner.

[Brief explanation of the drawing]

Fig. 1 is a perspective view of the weft thread removal device of the present invention, Fig. 2 is an enlarged sectional view of the main parts, Fig. 3 is a block diagram of the connection relationship between the controller and control elements, and Fig. 4 is the operating sequence of the controller. 5 is a perspective view of the weft thread removal device of another embodiment, FIG. 6 is an enlarged front view of the extraction means of another embodiment, and FIG. 7 is a block diagram of another embodiment. , FIG. 8 is a flowchart of the operating sequence of the controller. 1. Weft thread extraction device, 2. Extraction means, 3.
- 12th E inner means, 4... second guide means, 5... weft, 5a... weft end treatment system, 6... woven fabric, 7... weaving front, 8... holder, 11... nozzle receiver, 12... Nozzle, 14... Motor, 23... Suction port, 26... Cylinder, 29... Fulcrum shaft, 30... Cylinder, 35...
Controller, 36...Loom control device, 39...Drive circuit, 42...Claw, 44...Actuator, 48...Exclusion bar, 49...Solenoid, 52...Motor, 54.
55.56...Drive circuit. Patent Ratio Applicant Tsudakoma Kogyo Co., Ltd. Representative Patent Attorney Kunio Nakagawa Figure 7 Figure 2 Figure 3 Figure 4 Figure 5 Figure 6 Figure 7 Figure 8

Claims (5)

[Claims] (1) A pull-out means that grips and rotates the end of the weft to be extracted, thereby winding the weft from the weaving front; and a first guide means that moves the pull-out means between a standby position and an operating position. and a second guide means for moving the extracting means from the gripping position of the weft yarn in a direction away from the weaving front between the weft yarn end processing system and the weaving end. (2) The extraction means is rotatably supported by a hollow nozzle receiver, and the nozzle receiver is rotatably supported so as to be able to move forward and backward with respect to the nozzle receiver, and is configured to provide airflow in the weft suction direction and the weft discharge direction after winding. 2. The weft thread removing device according to claim 1, comprising a nozzle that generates the weft thread, a nozzle receiver for these nozzles, and a motor that rotates the nozzle. (3) The extracting means is comprised of a pair of claws that can be opened and closed, a motor that rotates the claws, and an exclusion bar that moves the weft thread wound around the claws in the discharge direction. The weft thread removal device according to scope 1. (4) The first guiding means is constituted by a cylinder, and the extracting means 2 is supported by the tip of the piston rod of the cylinder. The described weft thread removal device. (5) a holder in which the second guide means is supported by a shaft in a horizontal direction with respect to the piston rod of the first guide means;
The weft thread removal device according to claim 1, 2, or 3, characterized in that it is constituted by a cylinder provided between the holder and the piston rod.